地质条件对主采煤层冲击地压的影响研究

Study on the influence of geological conditions on rock burst in main coal seam

运用系统理论,采样试验和数据模拟等综合权重占比法进行多种地质条件耦合分析,对诱发屯兰矿主采2、8号煤层冲击地压危险性的开采深度、煤层上方100 m范围顶板岩层厚度及坚硬特征、地质构造引起的开采区域内应力变化以及煤层弹性能量和单轴抗压强度等客观地质条件深入系统的研究。结果表明,现开采区域地质条件对主采煤层冲击地压危险影响相对较小,危险等级为无冲击,对矿井其他煤层冲击评价提供重要理论和实际意义,但当后期规划设计及开采过程中采深、构造、煤岩层等地质条件发生显著变化时,应重新进行冲击危险性评价,及时为矿井安全高效生产提供指导。

Based on the comprehensive weight proportion method of system theory,sampling test and numerical simulation,the objective geological conditions,such as mining depth,thickness and strength of roof strata within 100 m above the coal seam,stress change in mining area caused by geological structure,and elastic energy and uniaxial compressive strength of coal seam,which induce the risk of rock burst in No.2 and No.8 coal seams of Tunlan coal mine,are systematically studied.The results show that the geological conditions of the mining area have relatively small impact on the rock burst risk of the main coal seam,and the risk level is no rock burst,which provides important theoretical and practical significance for the rock burst assessment of other coal seams in the mine.When the geological conditions such as mining depth,structure,coal and rock strata change significantly in the later design and mining process of the mine,the rock burst risk assessment should be carried out again to provide guidance for the safe and efficient production of the mine in time.